Please help me decide, Seq vs. non-seq (I searched and still can't decide)
 

I know I know, this topic has been betten to death, but I need some opionins. Her is my mod list:


1. Pinapple medium-large street port
2. PFC
3. M2 carbon fiber intake
4. M2 med SMIC
5. Keeping stock turbos
6. Full exhaust
7. All block off plates
8. Pulley’s
9.850's all around

The car is going to be used for road coarse events (high speed autocrosses) and an occasional trip to the drag strip. I am shotting for 330 at the wheels with those mods.
The basic benifits of seq- get full boost sooner
The negatives- boost problems and lots of shit under the hood.

How about simplified sequential, I havn't heard much about this, anyone done it?

Please give me your opioions and reason behind it.

I like sequential better. However, if you don't mind slight lag and extremely loud exhaust sound, then go with non-seq. With your mods you should get full boost around 3200 or so.

Full exhaust, intake, and a ported motor? Lag will be non-existent. Non-seq all the way! :)

I thought that a ported motor will increase lag.

:confused:

More airflow, less lag... Physics... :-)

ported motor hurts low end on its own...not sure about the turbo lag part. I will always vote sequential...have had both

I've got an apexi intake / full exhaust / street ported motor by rotary performance. The lag is incredibly unbearable if you're in the WRONG gear. If you're in the right gear... whoa, it feels good. Bear in mind I'm used to driving a mustang - torque on demand in almost any gear. Nothing beats the thrill of the FD though.

You will not be able to auto-x with non-sequential, at least, not very well. As far as road course being the same as high speed auto-x (what you inferred with the parantheses), it's not even the same thing.

As far as being on the road course or faster auto-x, the PFC will keep the twins in non-sequential anyway, as long as you don't drop below 3k rpm. I vote sequential.

<------ NON....

I'm no auto-x expert (read: never done it or even been to an event) but wouldn't you be well above 3000rpm the whole time anyway? It would seem to me that non-seq would be better in that case, because you'd have constant power and not have to deal with the snap oversteer that can be caused by transition.

Well, the best way to find out if you like it or not, is by doing the Poor man's non seq mod which later if you don't like it it is easily reversible. You will not gain the max power but will give you the idea of how non seq is like. Later you can go for the full non seq mod.

Here is some info:
https://www.rx7club.com/showthread.p...r+mans+non+seq

you will not gain any other information...everything regarding this topic has been posted/debated. Try searching.

Obviously, you've never auto-xed...:) There are many courses that have a tight kink or hairpin where you may drop below 3000 rpm in 2nd and it's not worth going into 1st due to the course design.

Also, as I stated above, the PFC keeps you in non-sequential once you pass the transition, until you drop back below 3k rpm. So, on the road course, the only place I worry about spinning out, the car is pretty much always in non-sequential anyway. But then I can drive on the street and enjoy the much better response of sequential. It's a win-win in my book.

Like a lot of topics, maybe we should just shut the servers down and say goodbye to the forum.

BTW-Thanks for your insightful input, it is really valued on this forum.

I am running high speed auto-x's at a road coarse. These are nothing like the parking lot stuff. I tried that and never really cared for it.

Anyways, I didn't know that the PFC keeps the turbos on the secondary? I never new that it did this? How does it do this? A little input please.

Once the twins are both on line (above transition), the PFC will keep both twins active until the rpm drops back down below 3000 rpm. At that point, the system goes back to primary only, with the secondary only coming in above transition.

On a road course, there is no reason to ever be below 3k rpm, let alone the transition, so you are essentially always in non-sequential on the track. This is a really great feature of the PFC for track driving, but it can occasionally be annoying on the street (entering a highway is the only time I ever notice it).

FWIW, the stock ecu does this as well but it is not as noticeable IMO and I don't remember the exact rpm range it works over.